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DISCUSSIONS.md

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Notes from various F2F discussions

Oct 18th (SES Strategy Meeting):

Notes about why we need realms:

  • ShadowRealms allow virtualization of the language itself.
  • Same origin is seen as legacy from some implementers, but same origin iframes is available anyways.
    • It is also available in node via vm module.
  • Same origin is an atomic part of the web reality.
  • Various examples of why ShadowRealms are needed:
    • Web-based IDEs or any kind of 3rd party code execution uses same origin evaluation.
    • Fiddler & Co.
    • JSPerf & Co.
    • Test frameworks (in-browser tests, but also in node using vm).
    • Most plugin mechanism for the web.
    • Sandboxing (e.g.: Oasis Project)
    • Server side rendering (to avoid collition and data leakage)